From Sahih Bukhari (Hadith 3078):
Narrated Abu `Uthman An-Nahdi:Mujashi (bin Mas`ud) took his brother Mujalid bin Mas`ud to the Prophet (ﷺ) and said, "This is Mujalid and he will give a pledge of allegiance to you for migration." The Prophet (ﷺ) said, "There is no migration after the Conquest of Mecca, but I will take his pledge of allegiance for Islam
Reference: Bukhari 3078